On the trapping of SOx on CaO-Al2O3-based novel high capacity sorbents

Physical Chemistry Chemical Physics : PCCP
Hendrik DatheJohannes A Lercher

Abstract

Calcium-aluminum mixed oxide based materials doped with Na and Mn were explored as sulfur trapping materials. The materials showed a three times higher total storage capacity and a higher time on stream with complete SO2 removal compared to a second generation SOx trapping material which was mesoporous with calcium mainly present in oxidic form. Combining in situ XANES at the S K-edge and IR spectroscopy the key properties of the storage materials and the affiliated storage processes were identified. CaO-Al2O3 acts as the primary support and storage component, while Na+ cations adjust the base strength and enhances the storage capacity. Manganese cations provide the appropriate oxidation capacity in absence and presence of up to 10% water. The transport into the bulk phase, which is markedly influenced by a layer of sorbed water, is the rate-limiting step in presence of Mn cations. In the absence of manganese cations the oxidation step appears controlling the rate. The overall reaction network, identified by in situ IR spectroscopy and the 2D Correlation Analysis, is similar on all materials.

References

Sep 5, 2003·Environmental Science & Technology·Karin LaursenC Jim Lim
Feb 11, 2005·Journal of the American Chemical Society·Peter HaiderDragos Ciuparu
Jul 21, 2006·The Journal of Physical Chemistry. B·Hendrik DatheJohannes A Lercher
Mar 21, 2005·Physical Chemistry Chemical Physics : PCCP·H A Al-Hosney, V H Grassian
Mar 21, 2005·Physical Chemistry Chemical Physics : PCCP·Hendrik DatheJohannes A Lercher

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Citations

Sep 25, 2010·Journal of Hazardous Materials·Ling ZhaoGuohua Chen
Oct 22, 2014·ChemSusChem·Christopher J KeturakisIsrael E Wachs
Oct 14, 2011·Physical Chemistry Chemical Physics : PCCP·Chang LiuHong He
Dec 22, 2006·The Journal of Physical Chemistry. B·Hendrik DatheJohannes A Lercher
Jun 15, 2006·The Journal of Physical Chemistry. B·Hendrik DatheJohannes A Lercher

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